Dental plate.



D. D. HYMAN.

DENTAL PLATE.

APPLICATION FILED MARG, 190B.

Patented Nov. 23,1909.

nuzuoz am@ y/fm# dwz/@MVK wma/,zwane 9;- @ya 5% if m D DAVID D. HYIVIAN,OF PHILADELPHIA, PENNSYLVANIA,

:DENTAL PLATE.

l Specification of Letters Patent.

Application led March 16, 1908.

Patented Nov. 23, 1909. serial No. 421,448.

To all 'whom it may concern.'

Be it known that I, Davia D. I-IYMAN, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Dental Plate, of which the following is aspecification.

My invention relates to a new and useful vdental plate and consists inproviding means for forming a suction betweenthe plate and the roof ofthe mouth for holding the plate in proper position.

It further consists in providing an overhang or flange which preventsescape of the air from the suction means.

It further consists in providing two cups or recesses for forming asuction.

Figure l represents a plan view of a dental plate embodying myinvention. Fig. 2 represents a sectional view thereof. Fig. 3 representsa sectional view on an enlarged scale.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings. I have found in practice that on the dentalplates now in use on the market that the suction device or means isimperfect by reason of the fact that if there is a slight movement orunequal pressure upon the plate, the air from the suction cavity orrecess will escape, allowing the plate to fall.

My invention is designed to overcome this defect and in the drawing, Ihave shown one form for carrying out my invention but it will be evidentthat the arrangement may be varied and other instrumentalities niay beemployed which will come within the scope of my invention and I do nottherefore desire to be limited in every instance to the exactconstruction as herein shown and described but desire to make suchchanges therein as may be necessary.

l designates a dental plate formed of any desired shape and material andupon the upper surface of which extends upwardly the wall 2, which is ofany desired shape and forms a recess or cavity 3 which serves as thesuction means. Extending inwardlyl from this wall, is an overhang orliange fl which forms around the wall a pocket 5. About the wall'2 at asuitable distance therefrom, I provide a second wall 6, which extendsupwardly froin the upper face of the plate, as will be evident, forminga space 7 between it and the said wall 2.

Then the plate l is placed in the mouth, it will be seen that by meansof the recess 8 a suction is formed between the plate and the roof ofthe mouth, so that the said plate will be held in proper position, andif there is any slight movement of the plate, escape of the air from therecess 3 is prevented by reason of the said overhang et, since the airin the recess will strike the said flange or overhang 4 by reason of theformation of the pocket It will be further understood that the flangegives an increased bearing surface upon the roof of the mouth whichassists in preventing escape of the said air from the recesses and thusbreaking the suction.

In addition, by reason of the space 7 formed between the walls 2 and G,a second suction is setup which further assists in holding the plate inposition. In this way a positive suction is formed between the mouth andthe plate with the evident results.

As shown in Fig. 8, I desire to preferably form the outer face of theplate of soft rubber, vulcanized or otherwise secured to the hard rubberplate l, the walls 2 and 6 as well as the flange l in this instancebeing also formed of soft rubber. It will be evident that any shape orforni of walls 2 and 6 may be constructed, depending upon the shape ofthe roof of the mouth to which the plate l is to be applied.

I am aware that it is old to form a plate with a single suction recessbut as far as I am aware, I am the first to form a plate with thesuction recess having an over-hanging flange in connection with thesecond suction recess.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:`

As an improved article of manufacture, a dental plate formed of hardrubber and having within the connes thereof an upwardly extendingupwardly from the upper face of i VVtHeSSeS:

extending wall forming a suction cavity, walls, Said cavity and spacebeing unobsald wall havmg :u1 mwardly extendmg structed, whereby theplate 1s provlded wlth overhang formmg mo'und the wall a pocket,lucreased suctlon surface.

said plate being formed with a second wall DAVID D. HYMAN.

the plate Outside of the first-named wall l1nd C. D. MCVAY, formingtherewith a space between said E. B. MORRIS.

